Method of sealing oxidized aluminum surfaces with aqueous soluti

Details Method of sealing oxidized aluminum surfaces with aqueous soluti Method of sealing oxidized aluminum surfaces with aqueous soluti

1977-11-02

1978-10-24

Mack, John H.

Chemistry: electrical and wave energy

Processes and products

C25D 1124

Patent

active

041219805

ABSTRACT:
In the process of treating an aluminum or aluminum alloy surface which comprises anodically oxidizing the surface and subsequently sealing the surface, the improvement consisting of sealing in an aqueous solution at a temperature between 90.degree. C and the boiling temperature of the solution, said aqueous solution having a pH value of from 4 to 8 and containing from 0.0005 to 0.2 gm per liter of cycloaliphatic or aromatic polycarboxylic acid or water-soluble salt thereof, said cycloaliphatic or aromatic polycarboxylic acid having 4 to 6 carboxyl groups.

REFERENCES:
patent: 3012917 (1961-12-01), Riou et al.
patent: 3440150 (1969-04-01), Kramer et al.
patent: 3838023 (1974-09-01), Friedemann et al.

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